Follow to Get Gifts We are new store , A variety of New backpack will on sale continually, Follow our store , So that you will get 1 gift , one ID can get 1 gift . Please remember to leave meage "i follow"when placing order, so the gift can be sent to you. brand Name: SAC A DOC Closure Type: Zipper Style: Casual and Fashion. size : 30cm*42cm*12cm. color : 8 colors are available. Items specifics : laptop backpack , Kids book bag , Waterproof Backpack, Women men daily backpack, School bags, Travel shoulder bag, Fashion backpack etc...... Please Kindly Notice: 1.allow 1-3 cm differences due to manual measurement. 2.slight color difference may exist due to lights, camera and different display settings. 3.if you want to customize your design , pls contact with us before place order. How to make it luminous. ( the black backgound means can luminous at night ) 1.This backpack needs to absorb light in the daytime and shine at dark. 2.The longer the backpack absorbs light,The longer the backpack in the dark glow time. 3.You need to carry it in the sun for some time.And then walk to the dark place. 4.Then it will be luminous.